Stadium: Hard Court 4 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Heraklion | 2023/11/05 09:00 | Dario Drebenstedt v Thomas Kostka | 2-6,0-6 |
| ITF M15 Heraklion | 2023/10/23 10:30 | Thomas Kostka v Andrew Fenty | 5-7,6-4,9-11 |
| ITF M15 Heraklion | 2023/10/22 09:30 | Thomas Kostka v Ighor Halmenschlager Reis | 6-3,6-1 |
| ITF M15 Heraklion | 2023/10/18 09:25 | Benjamin Pietri v Thomas Kostka | 6-3,6-2 |
| ITF M15 Heraklion | 2023/10/16 09:00 | Gian Luca Tanner v Thomas Kostka | 6-3,1-6,8-10 |
| ITF M15 Heraklion | 2023/10/15 08:30 | Evangelos Kypriotis v Thomas Kostka | 2-6,1-6 |
| ITF M25 Grasse | 2023/06/11 08:30 | Theo Herrmann v Thomas Kostka | 6-2,6-4 |
| ITF M15 Monastir | 2023/03/13 15:00 | Thomas Kostka v Zoran Ludoski | 3-6,2-6 |
| ITF M15 Heraklion | 2023/10/28 08:00 | Valentin Royer v Adam Heinonen | 6-3,6-3 |
| ITF M15 Heraklion | 2023/10/27 07:00 | Guy Den Ouden v Adam Heinonen | 6-7,6-1,2-6 |
| ITF M15 Heraklion | 2023/10/25 08:10 | Adam Heinonen v Graham Maassen | 6-4,6-3 |
| ITF M15 Heraklion | 2023/10/24 06:30 | Niels Visker v Adam Heinonen | 6-4,3-6,6-10 |
| ITF M15 Heraklion | 2023/10/23 10:30 | Piotr Siekanowicz v Adam Heinonen | 2-6,4-6 |
| ITF M15 Heraklion | 2023/10/17 06:30 | Adam Heinonen v Ki Lung NG | 5-7,4-6 |
| ITF M25 Falun | 2023/09/26 12:00 | Adam Heinonen v Evgeny Karlovskiy | 6-7,1-6 |
| ITF M25 Falun | 2023/09/25 08:00 | Adam Heinonen v Jack Karlsson Winstrand | 6-1,6-3 |